Thanks for your advice here, as always.
Time allows even poor planners a chance to get it right, and I've been delaying buying plants in order to catch the bigger errors.
I've just now brilliantly realized that the temperature in my planned "subtropical" terrarium will drop 20-30 degress at night, when the lights blink out. Will subtropical sundews like a drop from 80 F to 50 F, then back up to 80 F again the next day, ad infinitum?
The only plant that might like this that I know of is cephalotus, but I don't know about sundews and that is what I am hoping to grow.
If not, what could I grow in such a terrarium? I'm a little leery of heating the tank. I can ditch the lights altogether and put it in the sunlight with completely different plants, with or without a lid, at this point. I just want whatever I grow there to live.